9 - Operations related to timecode
59
TASC AM D A-78H R
4Use the ▲ and ▼ key s to set t he offs et fo r the
slave DA- 78HR, an d the SHIF Ted ▲ and ▼
key s to m ove t he cu rsor to th e dif fe re nt f i eld s .
You can also use the OFFSET key as a right
cursor key.
The front panel OFFSET indicator will light
when an offset value has been set.
See 4.3 .5, ““Left ” and “r i gh t” keys ” for detai l s
of setting values in a time field. You can set the
offset to sub-frame (percentage or sample)
accuracy.
5You can al s o c han ge the si gn of th e offset value
to a minus value by moving the cursor to the
appropriate position and using the ▲ and ▼
keys.
9.6.4 Cancelli ng timecode offset
To cancel the offset, simply set the offset value to
00:00:00:00.
1Enter the offset setting, as described above.
2Press and hold down the ▲ key and press the
▼ key to reset the value.
Timecode offset will now be cancelled and the
front panel OFFSET indicator will go out.
9.6.5 Setting timecode of f set “ on the fly”
As well as entering an absolute number, it is also pos-
sible to enter a number “on the fly” as the tapes are
playing.
1Loca te the two d evices ( master an d slave DA-
78HR) so that they have the right offset, either
by playing the t apes and pausing them or carry
out the next operation while one or both tapes
is being played back.
2On the slave DA-78HR, press and hold the
SHIFT key, and press the AUTO IN/OUT
(OFFSET) key at the correct offset time to cap-
ture and store the offset.
The display wil l briefly sho w AT. OFFSET (AT
OFFSET), and the current difference between
the master unit and slave DA-78HR will be
stored as an offset.
9.6.6 Park pos ition
When the DA-78HR is slaved to an external time-
code source, it will take some time between the mas-
ter unit starting to play and starting to transmit
timecode for the DA-78HR to read.
These functions allow you to measure and test the
optimum pre-roll position for the DA-78HR (when it
is a timecode slave) to park itself relative to the mas-
ter timecode device so that it will lock up and start
playing quickly.
1Press the SHIFT key s o that t he SHIFT indicator
is flashing, then press the MENU key until the
display show s tc. chs-- (TC CHS--).
2Press the S UB MENU key so that the display
shows PARK. POS (PARK PO S) briefly, and
then changes to PRK (PRK) fo l lowe d b y the
current setting, shown in seconds and frames.
3Use the ▲ and ▼ key s to ad just th e val u e
(maximum is 1 second and 29 frames)
9.6.7 A utomatic park positi on setting
When the DA-78HR is acting as a timecode slave, it
can automatically determine the optimum park pre-
roll position to sync with the master.
1Turn the DA-78H R’s CHASE on, if it is off and
make sure that the time mode is set to TC.
2Press the SHIFT key s o that t he SHIFT indicator
is flashing, then press the MENU key until the
display show s TC. CHS-- (TC CHS--).
3Press the S UB MENU key so that the display
shows PK. POS. TST (PK POS TST) briefly,
and then changes to OFF (OFF).
4Play and stop the master tape.
5Use the ▲ or ▼ key to turn the park test on.
The DA-78HR will then rewind so that the rel-
ative difference is zero. When the DA-78HR
has stopped, g o on to the next step bel ow.
6Play the timecode master.
When the value shown on the display has
stopped changi n g an d is stabi l ized, go on to the
next step below.
7Use the ▲ or ▼ key to turn the park test off.
The display sho ws done (DONE
), and the
optimum park pre-roll time for the timecode
master is now stored.
9.6.8 Absolu t e and relati ve differe nce
The offset as set above (“Timecode offset” on
page 58) can be called the “absolute difference”
between the two times. However, if the slave
machine “wanders” (actually, this is unlikely), the
offset (theoretical difference) will not be equal to the